The major problem faced by optical astronomers in trying to deduce the structure of the MilkyWay Galaxy is that we can see only a small part of it because of the ________.
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Q94: The Galactic center in _ is best
Q95: Why is visible light a bad choice
Q96: Describe our location in the Milky Way.
Q97: Arcturus shows a large proper motion, almost
Q98: Spiral arms are thought to be sites
Q100: We can estimate the mass of the
Q101: Who was Henrietta Leavitt, and what did
Q102: How old is the Galaxy? How do
Q103: List at least one naked-eye observation that
Q104: How are Cepheids and RR Lyrae stars
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